Abstract: The memory of the storage device is divided into information areas of identical size selected from different parts of the storage device, and control zones are selected from different parts of the device. Each group of data is a set of code words written to a corresponding information zone. Three reference control sums S0, S1, S2, each according to a corresponding preset formula, are established by a computation unit. The reference control sums are written as a code word with the same number to a corresponding control zone. If a part of the storage device fails and data becomes corrupted, the current control sums are calculated with the aid of the computation unit. The values of the stored reference control sums and the current control sums are used for recovering lost data. The number of equations depends on the number of failed or faulty zones in the storage device.